MnBa2(HPO4)(2)(H2PO4)(2)

Crystals of manganese(II) dibarium bis(hydrogenphosphate) bis(dihydrogenphosphate), MnBa2(HPO4)(2)(H2PO4)(2), were obtained by hydrothermal synthesis. The title compound is isotypic with its Cd-II and Ca-II analogues. The structure is built up of an infinite {[MnBa2(HPO4)(2)(H2PO4)(2)](4) }(n) chain running along [100], which consists of alternate MnO6 octahedra and [PO4] tetrahedra, in which the centrosymmetric MnO6 octahedra share their four equatorial O-atom corners with tetrahedral [PO3(OH)] groups and their two axial apices with tetrahedral [PO2(OH)(2)] groups. These chains are held together by BaO9 coordination polyhedra, developing into a three-dimensional structure. The O-H center dot center dot center dot O hydrogen bonds additionally stabilize the structural set-up. Due to the ionic radius of Mn2+ being much smaller than those of Ca2+ and Cd2+, this may imply that their adopted structure type has a great tolerance for incorporating various ions and the exploitation of more diverse compounds in the future is encouraged.